摘要
煤矿6 kV～10 kV电网中发生单相接地故障时,其消弧线圈的补偿作用使得故障信号变得很微弱,给故障选线技术带来很大困难。提出一种采用模式识别的小电流接地选线方法,即对每条线路分别建立故障数学模型,各条线路同时利用采集的电流电压数据求最小二乘意义下模型方程的解,依据得到的线路对地电容判断实际发生故障是否符合所建立的模型,进一步识别出故障线路。现场记录的数据验证了该方法的正确、可靠性。
The single-phase grounding fault happens in the 6 kV ～ 10 kV coal mine power system,the compensation effect of arc-suppression coil makes the fault signal weak,which is brought a great deal of difficult to fault wire selection.The low current grounding wire selection method with recognition pattern is being raised.This method sets up fault mathematic model for each wire.The result of model equation within least squares is get from the collect data of current and voltage of each wire simultaneously,according to the result of selected wires to judge the actual failure whether meets the set-up model or not,then distinguish the fault wire.The data of record on spot testified the correctness and reliability of this method.
出处
《煤矿机电》
2011年第2期41-43,46,共4页
Colliery Mechanical & Electrical Technology
关键词
单项接地故障
模式识别
漏电保护
single-phase grounding fault
pattern recognition
leakage protection
